Printing arrangement for rotary duplicators



F iled May 19, 1955 Feb. 17, 1959 w. RITZERFELD ET AL 2,873,670

PRINTING ARRANGEMENT FOR ROTARY DUPLICATORS 2 SheetsSheet 1 ,8 WQMQSS M My Feb. 17, 1959 w. RITZERF'ELD ET AL 2,

PRINTING ARRANGEMENT FOR ROTARY DUPLICATORS 2. Sheets-Sheet 2 Filed May 19, 1955 MM a l am e r. eh M? 0n Mm QT np uO mmw Q uinn 7 2,873,670 PRINTING ARRANGEMENT FOR ROTARY DUELICATORS Wilhelm Ritzerfeld, Berlin-Dahlem, and Gerhard Ritzerfeld, Berlin-Grunewald, Germany Appiication May 19, 1955, Serial No. 509,592 In Germany October 1, 1948 Public Law 619, August 23, 195.4 Patent expires October 1, 1968 15 Claims. (Cl. 101-432) The present invention relates to a printing arrangement for rotary duplicators as are used for duplicating printed forms and mirror script master sheets on copy sheets, and more particularly relates to a printing atrangement in which additional printing means are provided.

In a rotary duplicator of this type, holding or clamping means are provided on the printing roller for holding the printing form. According to the prior art, additional printing means are mounted on the printing roller, but are separated by the clamping means from the printing form so that the imprint of the additional printing means is not close to the text printed by the printing form.

It is an object of the present invention to overcome the disadvantages of the prior art, and to provide an arrangement permitting imprints of additional printing means to be made directly adjacent the imprint made by the printing form.

It is another object of the present invention to provide additional printing means within recessed portions of the holding means for the printing form, so that the additional printing means is located directly adjacent the printing form.

It is a further object of the present invention to mount the holding or clamping means, and the additional print ing means in a recess of the printing roller so that the additional printing means project only slightly from the clamping means and from the printing roller and are well protected.

it is another object of the present invention to provide indicating means associated with the additional printing means for indicating diii'erent printing positons of the same.

It s a further object of the present invention to arrange the indicating means spaced from the additional printing means and provide common operating means for simultaneous operation of the additional printing means and indicating means.

Another object of the present invention is to provide stamping rolls as additional printing means, and to provide a stamping pad for inking the stamping rolls during rotation of the printing or duplicating roller carrying the same.

With these objects in view, the present invention mainly consists in a rotary duplicator which comprises, in combination, a rotary printing roller, holding means mounted on the printing roller and having at least one holding portion for holding a printing form and at least one recessed portion, and additional printing means, such as stamping rolls, arranged in the recessed portion of the holding means.

According to one embodiment of the present invention the clamping means have a recess in which the stamping rolls are arranged. According to another embodiment of the present invention the holding means are clamping means which include spaced clamping portions mounted on a common shaft, and the stamping rolls are arranged in the recessed portions of the clamping means formed between the clamping portions and the shaft.

States Patent ice Preferably, the additional printing means, such as stamping rolls, are resiliently mounted in a recess of the printing or duplicating roller and project slightly from the surface of the same. When the additional printing means pass the printing line defined by the printing roller and the counterpressure roller, they are resiliently pressed into the recess of the printing roller.

In the event that the additional printing means. are stamping rolls, an inking pad is arranged adjacent the duplicating roller so that the stamping rolls are inked during rotation of the printing roller.

Indicating wheels are associated with. the stamping wheels, and operating means including ratchet means are provided for simultaneously shifting the stamping rolls and the indicating wheels between associated positions.

The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings, in which;

Fig. 1 is a fragmentary cross-sectional view of a rotary duplicator according to the present invention;

Fig. la is a fragmentary plan view of the rotary duplicator illustrated in Fig. 1;

Fig. 2 is a fragmentary side view, partly in section, Of a modified detail of the rotary duplicator shown in Figs. 1 and 1a; and.

Fig. 2a is a fragmentary plan view of the embodiment illustrated in Fig. 2.

Referring now to the drawings, and more particularly to Fig. 1, the holdingor clamping means 2 are mounted in a recess of the printing or duplicating roller 30, and are formed with recesses 2a in which the additional printing means 1 are mounted. The additional printing means are shown to be a plurality of stamping rolls 1, which may be designed for stamping consecutive numbers when turned about shaft 3. Shaft 3 is resiliently mounted by means of a spring 3a and constitutes a movable support for stamping rolls 1. The stamping rolls 1 are turnable together with the ratchet wheel means 6, the locking pawl 5 preventing turning of the stamping wheels and of the ratchet wheel means 6 in onedirection. A spring 4 urges the locking pawl 5 into engagement with the ratchet wheel means 6.

Indicating wheels E, respectively associated with the stamping rolls 1, are arranged spaced from the printing roller 30 and mounted on a support 7 for rotation together with the ratchet wheel means 11. The indicating wheel means 3 and the ratchet wheel means 11 are prevented from rotation in one direction by a locking pawl it? which is spring -loaded by means of spring 9.

Operating means 12, 13, 20, 21, 24, 16 and 17 are provided for simultaneously shifting the stamping rolls 1 and the indicating wheels 8 between corresponding printing and indicating positions, respectively.

An operating rod 12 is turnably mounted in the frame of the machine and has a portion of rectangular cross section on which the slide 13 is mounted. The slide 13 is movable in longitudinal direction of rod 12 and nonrotatable thereon. The slide 13 is provided with spring loaded catch-balis id cooperating with recesses 15 in the square portion of rod 12. The recesses 15 define a plurality of axially shifted positions of the slide 13 in which the ratchet pawls 16 and 17 cooperate with different ratchet wheels 6 and ii for operating different stampingrolls 1 and indicating wheels 8. Turning of the rod 12 by means of handle 24 results in engagement of the ratchet pawls 16 and 17 with the ratchet wheel means 6 and 11, respectively, so that the stamping rolls and the indicating wheels corresponding thereto are simultaneously shifted.

It will be understood that the stamping rolls are turnable between a plurality of printing positions defined by the locking pawl 5, for instance for printing consecutive numbers. The indicating wheels 8 are similarly shiftable between a plurality of indicating positions defined by the locking pawl 10 for indicating the respective number in the window 8a of the casing.

The ratchet pawl's 16 and 17 are pivotally mounted on pins 20 and 21, respectively, and urged by spring means 16a and 17a against the stops 18 and 19. Consequently, the ratchet pawls 16 and 17 are rigid in operative posit on, but are capable of pivoting during disengagement from the ratchet wheels 6 and 11. A spring 22 is so cured to a stop pin 23 and to the operating rod 12 for returning the same and the ratchet pawls l6 and 17 into initial position.

A movable supporting means, such as bell-crank lever means 27, is pivotally mounted on the operating rod 12 and carries on one arm thereof a cam follower roller 28 which rides on the cam track of a cam disc 29a which has a projecting cam lug 29. A shaft 25 is mounted on the other arm of the bell-crank lever means 27 and turnably supports cylindrical stamp pad means 26 which contains ink for inking the stamping rolls 1. At the moment in which the stamping rolls 1 pass the stamp pad 26, the cam lug 29 engages the cam follower roller 28 so that the movable supporting means 25, 27 are shifted and the stamp pad 26 is moved into the circular path of the slightly projecting portion of the stamping rolls 1 so that the same are inked. Due to the fact that the stamp pad means 26 moves away from the printing roller 30 when the stamping rolls 1 have passed, an inking of a printing form clamped in the clamping means 2 and located on the surface of theduplicating roller 39 is prevented. A protective cover 2611, fixed on lever means 27, envelops the stamp pad 26 and has a slot opposite the printing roller so that engagement between the stamping rolls 1 and the stamp pad 26 is possible during rotation of the printing roller 30. The stamp pads 26 are sleeves loosely mounted and freely movable on shaft 25, which is pivoted in the bell-crank lever means 27. When the stamping rolls 1 pass stamp pads 26 during turning of printing roller 30, roller 28 of the bell-crank lever 27 is engaged by the nose of cam disc 2% and therefore the bell-crank lever 27 turns and presses stamp pads 26 against the passing stamping rolls 1. The protective cover 26a prevents dripping of ink from the stamp pads 26.

" 'Referring now to the modified embodiment of the present invention illustrated in Figs. 2 and 2a, the duplicating or printing roller 33 is provided with a recess 32 in which the holding or clamping means and additional printing means are mounted. In this embodiment the clamping means include a shaft mounted on the printing roller 33 and a plurality of clamping or holding portions 34 which are secured to the shaft 36 and arranged spaced from each other in axial direction of the printing roller 33. The clamping faces 40 of the clamping portions 34 engage the surface of the recess 32 under the action of a spring 39 which is mounted on a pin 38. When the eccentric shaft 41 is turned, the clamping means 34, 35 turn for releasing and clamping, respectively, a printing form such as a duplicating master sheet. The clamping or holding portions 34 of the clamping or holding means 34, 3S define between each other recessed portions of the clamping means 34, 35 in which additional printing means, such as stamping roll means 37, are located. The stamping rolls 37 are arranged in groups which are mounted on pins 43 in movable supports 42. The supports 42 are mounted in the recess 32 turnable about shaft 36. A spring 44 urges each movable support 42 into a position in which the stamping rolls 37 slightly project out of the recess 32 of the duplicating roller. When the stamping rolls 37 pass the counter pressure roller of the duplicating machine, the movable supports 42 turn and tension springs 44 so that the stamping rolls 37 are pressed into the recess 32. The projecting position of the stamping rolls 37 can be adjusted by a threaded stop 45 which is threaded into each movable support 42 and engages the shaft 35. Ratchet wheel means 37a are schematically indicated in Fig. 2, and it will be understood that these ratchet wheel means are provided in a manner corresponding to the arrangement described with references to Figs. 1 and 1a. Operating means and indicating wheel means are provided in the arrangement of Figs. 2 and 2a in the manner shown in Figs. 1 and 1a for indicating the shifted printing positions of the stamping wheels 37. Similarly, a shiftable stamping pad operated by a cam is provided in the arrangement shown in Figs. 2 and 2a. In other words, Figs. 2 and 2a illustrate a modified detail of the machine shown in Figs. 1 and la, but otherwise the duplicating machine is constructed in the manner illustrated in Figs. 1 and In.

It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of duplicating machines-differing from the types described above.

While the invention has been illustrated and described as embodied in a duplicating machine in which shiftable stamping rolls are arranged in recessed portions of clamping means for a printing form, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can by applying current knowledge readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention and, therefore, such adaptations should and are intended to be comprehended within the meaning and range of equivalence of the following claims.

What is claimed as new and desired to be secured by Letters Patent is:

1. In a rotary duplicator, in combination, a rotary duplicating roller having a position of rest; movable holding means mounted in a recess of said duplicating roller and having at least one holding portion for holding a duplicating form and at least one recessed portion; additional printing means arranged in said recessed portion of said holding means, said additional printing means being shiftable between a plurality of positions; a supporting frame supporting said roller; shiftable indicating means arranged spaced from said additional printing means on said supporting frame and being shiftable between a plurality of positions corresponding to said positions of said additional printing means; and operating means on said supporting frame spaced from said duplieating roller and mounted shiftable between an inoperative position and an operative position, said operating means in said operative position cooperating with said additional printing means and said indicating means only in said position of rest of said roller for simultaneously shifting said additional printing means and said indicating means between corresponding positions.

2. In a rotary duplicator, in combination, a rotary duplicating roller having a position of rest; movable clamping means mounted in a recess of said duplicating roller and having at least one clamping portion for clamping a duplicating form and at least one recessed portion; additional printing roll means arranged in said recessed portion of said clamping means and being turnable between a plurality of printing positions; a supporting frame supporting said roller; indicating wheel means arranged spaced from said additional printing roll means on said alasupporting frame and being turnablebetween it -plurality of indicating positions corresponding to said printing positions of said additional printing roll means; and operating means on said supporting frame spaced from said duplicating roller and mounted shiftable between an inoperative position and an operative position,v said operating means in said operative position cooperating with said additional printing roll means and said indicating wheel means only in said position of rest of said. roller for simultaneously shifting said additional printing roll means and said indicating wheel means between corresponding printing and indicating positions, respectively.

3. In a rotary duplicator, in combination, a rotary duplicating roller having a position of rest; movable clamping means mounted in a recess of said duplicating roller and having a plurality of clamping portions spaced in axial direction of said duplicating roller for clamping a printing form, said clamping portions defining between each other recessed portions of said clamping means; and additional printing means located in said recessed portions of said clamping means and being mounted on said printing roller shiftable between a plurality of positions; a supporting frame supporting said roller; and operating means on said supporting frame for shifting said additional printing means between said positions and cooperating with said additional printing means in said position of rest of said duplicating roller only, said operating means being spaced from said duplicating roller and in an inoperative position during turning of said duplicating roller.

4. In a rotary duplicator, in combination, a rotary printing roller having a position of rest; movable clamping means mounted in a recess of said printing roller and having a plurality of clamping portions spaced in axial direction of said printing roller for clamping a printing form, said clamping portions defining between each other ecessed portions of said clamping means; additional printing roll means mounted on said printing roller and being located between said clamping portions, said additional printing roll means being turnable between a plurality of printing positions; a supporting frame supporting said roller; indicating wheel means arranged spaced from said additional printing roll means on said supporting frame and being turnable between a plurality of, indicating positions corresponding to said printing positions of said additional printing roll means; and operating means on said supporting frame spacedfrom said duplicating roller and mounted shiftable between an inoperative position and an operative position, said operating means in said operative position cooperating with said additional printing roll means and said indicating, wheel means only in said position of rest of said roller for simultaneously shifting said additional printing roll means and said indicating wheel means between corresponding printing and indicating positions, respectively.

5. In a rotary duplicator, in combination, a rotary printing roller having a position of rest; movable clamping means mounted in a recess of said printing roller and having at least one clamping portion for clamping a printed form and at least one recessed portion; additional printing roll means arranged in said recessed portion of said clamping means and being turnable between a plurality of printing positions; first ratchet means connected to said additional prin ing roll means for rotation therewith; a supporting frame supporting said roller; indicating wheel means arranged spaced from said additional printing roll means on said supporting frame and being turnaole between a plurality of indicating positions corresponding to said printing positions of said additional printing ro-ll means; second ratchet means on said supporting frame connected to said indicating wheel means for rotation therewith; and operating means on said supporting frame spaced from said duplicating roller and including first and second ratchet pawl means cooperating respectively with said first and second ratchet means only in said position of rest of said roller for simultaneously shifting said additional printing roll means and said indicating wheel means between corresponding printing and indicating postions, respectively.

6. In a rotary duplicator, in combination, a rotary duplicating roller having a position of rest; movable clamping means mounted in a recess of said duplicating roller and having at least one clamping portion for clampinga duplicatingform and at least one recessed portion; additional printing roll means arranged in said recessed portion of said clamping means and including a plurality of rolls having a common axis extending in axial direction of said printing roller, each of said rolls being turnable between a plurality of printing positions; a supporting frame supporting said roller; first ratchet means connected to said additional printing roll means for rotation therewith; indicating wheel means arranged spaced from said additional printing roll means on said supporting frame and including a plurality of indicating wheels having a common axis extending in axial direction of said printing roller, each of said wheels being turnable between a plurality of indicating positions corresponding to said printing positions of said additional printing rolls; second ratchet means on said supporting frame connected to said indicating Wheel means for rotation therewith; and operating means on said supporting frame spaced from said duplicating roller and including first and second ratchet pawl means cooperating respectively with said first and second ratchet means only in said position of rest of said roller for simultaneously shifting associated printing rolls and indicating wheels between corresponding printing and indicating positions, respectively.

7. In a rotary duplicator, in combination, a rotary duplieating roller formed with a recess and having a position of rest; movable clamping means mounted in said recess of said duplicating roller and having at least one clamping portion for clamping a duplicating form and at least one recessed portion; stamping roll means arranged in said recessed portion of said clamping means and being mounted in said recess of said duplicating roller turnable between a plurality of printing positions, said stamping roll means projecting slightly out of said recess of said printing roller; a supporting frame supporting said roller; indicating wheel means arranged spaced from said additional stamping roll means on said supporting frame and being turnable between a plurality of indicating positions corresponding to said printing positions of said stamping roll means; operating means on said supporting frame spaced from said duplicating roller and mounted shiftable between an inoperative position and an operative position, said operating means in said operative position cooperating with said stamping roll means and said indicating wheel means only in said position of rest of said roller for simultaneously shifting said stamping roll means and said indicating wheel means between corresponding printing and indicating positions, respectively; and stamp pad means arranged on said supporting frame adjacent said duplicating roller and cooperating with said stamping roll means in said position of rest of said roller so that the same engage said stamp pad means during each rotation of said duplicating roller.

8. An arrangement as claimed in claim 7 and including means movably supporting said stamp pad means.

9. In a rotary duplicator, in combination, a rotary duplicating roller formed with a recess and having a position of rest; movable clamping means mounted in said re- ,cess of said duplicating roller and having at least one clamping portion for clamping a duplicating form and at least one recessed portion; stamping roll means arranged in said recessed portion of said clamping means and being mounted in said recess of said duplicating roller turnable between a plurality of printing positions, said stamping roll means projecting slightly out of said recess of said printing roller; a supporting frame supporting said roller;

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indicating wheel means arranged spaced from said additional stamping roll means on said supporting frame and being turnable between a plurality of indicating positions corresponding to said printing positions of said stamping roll means; operating means on said supporting frame spaced from said duplicating roller and mounted shiftable between an inoperative position and an operative position, said operating means in said operative position cooperating with said stamping roll means and said indieating Wheel means only in said position of rest of said roller for simultaneously shifting said stamping roll means and said indicating wheel means between corresponding printing and indicating positions, respectively; a movable support on said supporting frame including a cam follower means; stamp pad means arranged adjacent said duplicating roller and being supported by said movable support, said stamp pad means cooperating with said stamping roll means so that the same engage said stamp pad means during each rotation of said duplicating roller; acam means connected to said duplicating roller for rotation therewith and having a cam track cooperating with said cam follower means for shifting said movable support and thereby said stamp pad means away from said duplicating roller so that said stamp pad means is spaced from said duplicating roller while a printing form held by said clamping means moves past said stamp pad means.

10. An arrangement as claimed in claim 9 wherein said stamp pad means is cylindrical and wherein said supporting means is a bell-crank lever having one arm supporting said stamp pad means and another arm carrying said cam follower means.

11. An arrangement as claimed in claim 10 and includ' ing a tubular protecting cover means enveloping said stamp pad means and formed with an opening located opposite said printing roller.

12. An arrangement as claimed in claim 11 wherein said protecting cover means is movable between a first position in which said opening is located opposite said printing roller and a second position in which a portion of said protecting cover means is located opposite said printing roller so as to protect a printing form moving with said printing roller past said stamp pad means from engagement with said stamp pad means.

' 13. In a rotary duplicator, in combination, a rotary duplicating roller having a position of rest; movable clamping means mounted in a recess of said duplicating roller and having at least one clamping portion for clamping a form and at least one recessed portion; additional printing roll means located in said recessed portion of said clamping means and including a plurality of rolls having a common axis extending in axial direction of said duplicating roller, each of said rolls being turnable between a plurality of printing positions; a supporting frame supporting said roller; indicating wheel means arranged spaced from said additional printing roll means on said supporting frame and including a plurality of indicating wheels having a common axis extending in axial direction of said duplicating roller, each 0t said indicating wheels being turnable between a plurality of indicating positions corresponding to said printing positions of said additional printing rolls; and operating means including an operating rod on said supporting frame extending in axial direction of said printing roller spaced from the same and from said indicating wheel means, a slide means non-rotatably mounted on said operating rod and movable on the same in longitudinal direction of said rod, first and second actuating means mounted on said slide means, and respectively associated with said additional printing roll means and said indicating wheel means for shifting said rolls and said wheels between said positions of the same only in said position of rest of said roller so that in shifted positions of said slide means said actuating means simultaneously shift difierent associated printing rolls and indicating wheels between corresponding printing and indicating positions when said operating rod is turned While said duplicating roller'is at a standstill in said position of rest.

14. In a rotary duplicator, in combination, a rotary duplicating roller turnable to a position of rest and formed with a'recess; movable holding means mounted in said recess of said duplicating roller and having at least one holding portion for holding a duplicating form and at least one recessed portion; additional printing means located in said recessed portion of: said holding means and being shiftable between a plurality of printing positions; supporting means supporting said duplicating roller; and operating means mounted on said supporting means spaced from said duplicating roller and being shiftable between an inoperative position, and an operative position for shifting said additional printing means between said positions, said operating means in said operative position cooperating with said additional printing means only when said duplicating roller is stopped in said position of rest.

15. In a rotary duplicator, in combination, a rotary duplicating roller turnable to a position of rest and being formed with a recess; movable clamping means mounted in said recess of said duplicating roller and having a clamping portion extending in axial direction of said roller for clamping a duplicating form and at least one recessed portion; additional printing roll means arranged in said recessed portion of said clamping means and including a plurality of rolls having a common axis extending in axial direction of said duplicating roller, each of said rolls being turnable between a plurality of printing positions; a supporting frame supporting said duplicating roller; first ratchet means connected tosaid additional printing roll means for rotation therewith; indicating wheelmeans turnably mounted on said frame spaced from said printing roll means and including a plurality of indicating wheels having a common axis extending in axial direction of said duplicating roller, each of said wheels being turnable between a plurality of indicating positions respectively associated with said printing positions of said printing rolls; second ratchet means mounted on said frame and connected to said indicating wheel means for rotation therewith; and operating means including an operating 'rod mounted on said frame extending in axial direction of said printing roller spaced from the same and from said indicating wheel means; a slide means non-rotatably mounted on said operating rod movable in longitudinal direction of said rod, first and second ratchet pawl means cooperating respectivelywith said first and second ratchet means only in said position-of rest of said duplicating rollerfor simultaneously shifting associated printing rolls and indicating wheels between corresponding printing and indicating positions, respectively, longitudinal movement of said slide associating said first and second ratchet pawl means with ditierent printing rolls and indicating wheels, respectively.

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